Question

Qual as cordenadas do vertice: y= 2x² + 4x -9
a) (-7;10) b) (1;-7) c) (0;1) d) (-7;0) e) (0;0)

Answer 1

Xv= $\frac{-b}{2.a}$
YV= $\frac{-Δ}{4.a}$

Xv= - $\frac{4}{2.2}$ = $\frac{4}{4}$ = 1
YV= $\frac{[(4)^{2} - 4. (2). (-9)] }{4.2}$ = $\frac{16-72}{8}$ =$\frac{-56}{8}$ = -7

Resposta: letra B